Working Theory

If you’re past upgrading your silencer or header, and you're looking for even more performance level, decat your exhaust. catalyst converters are a vital component in our environmentally conscious world however by virtue of their restrictive honeycomb substrate and oversized body, they decrease the engine HP. When you need to maximize performance level, removing the factory catalytic converter and fitting a cat bypass comes in picture. Mercedes 420SEC decat is a perf-tube absorption-type muffler that replaces the stock catalyst converter and unleashes the true performance potential of the engine by promoting the exhaust flow. decat outperforms even a high flow 200 Cell Per Inch catalyst converter. http://www.magnumtuning.com/en/subcategorylist/car-truck-suv-ecu-performance-chips-fuel-savers-water4gas/car-truck-performance-chips-oxygen-o2-sensor-simulators#simulators This Mercedes 420SEC catalytic converter delete acts as a cat bypass but still maintains certain restriction against exhaust gas in order to not cause the exhaust to be under-restricted. If the catalyst converter is replaced with a straight pipe, the exhaust system tone becomes higher pitched and metallic while the mid and low rotational speed range becomes sluggish.

Magnum Mercedes 420SECde-cat pipe replaces the stock restrictive catalyst converter. It allows the exhaust gasses to flow much more freely, improving the pony of the engine and improving throttle sensitivity. The common reason people decat their vehicles is because a stock cat converter can be a large restriction in the exhaust system, and removing it can free up perceptible amounts of horsepower and can notably boost fuel mileage. Get rid of restrictive catalyst converter that robs you of performance potential. Magnum Mercedes 420SEC catalyst converter bypasss feature engine specific gas restriction. Your decat test pipe will fit to factory exhaust piping. Magnum decat pipe is a racing part. Please be aware of the bylaws and regulations, cat eliminators are not street legal in several US states and countries. Dual exhausts with two catalyst converters in each bank require two units. Magnum Tuning warrants that all Magnum decat pipes are free from defects, blowouts and the shipped cat converter eliminator’s dimension / gas restriction will fit the specified vehicle. bear in mind that Magnum Mercedes 420SEC catalytic converter deletes install universal with MIG/TIG/Flux weld-on technology.

The factory catalyst resides inside the exhaust. Its task is to create cleaner emissions by causing a reaction which reduces the CO2 and NO2 in the exhaust. Because their substrate is constructed of a honeycomb matrix they impede the exhaust gas flow and have been blamed by many as performance capability stealers. With our Mercedes 420SEC decat pipe you can regain this robbed performance potential and save money. You can have this catalyst converter delete for a fraction of the dealer’s price you’d pay if you bought an OEM catalyst converter.

The best choice if you are planning to gut the stock catalyst converter. Mercedes 420SEC decat exhaust pipe is a great way to add power output to your power train if you are planning to use it in a non-pollution controlled environment. This Mercedes 420SEC decat is designed to deliver you optimum exhaust gas flow. This cat converter replacement part eliminates the stock catalyst. This exhaust tuning device will increase both the performance potential and exhaust system note of your Mercedes 420SEC.

Packing List

1 x Decat Muffler

1 x Installation Instructions

On modern fuel injected engines, the check engine light is triggered by decats due to changes in the exhaust oxygen sensor's readings as a result of larger amounts of free oxygen in the exhaust system. CEL causes the engine to run in safe mode with lean fuel programming. Our oxygen sensor simulators available to all vehicles, fitted with zirconia type oxygen sensors, remedy all catalyst efficiency or oxygen sensor related failure codes and rid your engine of limp mode.

Answer: As emissions increase, chances are your vehicle will fail the inspection depending on the requisites of smog test applied by your local Department of Motor Vehicles. You may prefer high flow catalytic converters that conform to the evaporative emission standards in most countries and states.

Question: Are Magnum Decats Street Legal?

Answer: Decats are street legal only in those US states and countries where there is no emission inspection program in effect. To find out more, you may contact your local Registry of Motor Vehicles or Department of Motor Vehicles.

Claims stated in this description are warranted by Magnum Tuning.

Emissions and the oxygen sensor

An automotive oxygen sensor, also known as an O2 sensor, lambda probe, lambda sensor, lambda sonda or EGO (exhaust gas oxygen) sensor, is a small sensor inserted into the exhaust system of a petrol engine to measure the concentration of oxygen remaining in the exhaust gas to allow an electronic control unit (ECU) to control the efficiency of the combustion process in the engine. In most modern automobiles, these sensors are attached to the engine's exhaust manifold to determine whether the mixture of air and gasoline going into the engine is rich (too much fuel) or lean (too little fuel). This information is sent to the engine management ECU computer, which adjusts the mixture to give the engine the best possible fuel economy and lowest possible exhaust emissions.

On cat-less engines, after catalytic converter conducts gas purification no more, exhaust produces more harmful combustion products. Oxygen sensor delivers the electronic engine management accurate information on gas consistency, that has materially changed, so ECU registers persistent error, with other words check engine light (CEL), also referred to as MIL is triggered. Until engine runs in limp mode, fuel- and ignition programming is set to safe preload that restricts power and spoils fuel efficiency. To remedy oxygen sensor failure code, on most engines you need to wire up an oxygen sensor simulator to downstream oxygen sensor(s).

Worry of having CEL issue after gutting your catalytic converter? Check out our oxygen sensor simulator designed to remedy the trouble codes.

sounded and performed great

Bought one for my uncle's Trajet and it was just what he needed. It's been on the car for couple of months and sounded and performed great. The exhaust note off of the tail pipe is a little louder then i had thought but my uncle's ears… The only minus we faced decat is far heavier than original catalyst. Keep up with the sensational tech support, mates.

0 of 1 people found this review helpful.

Was this review helpful?

YesNo

(5/5)

Ease of installation

Quality

Price to value ratio

Shipping & Wrapping

Customer & Tech Support

Very Happy

These guys are great to deal with! I ordered O2 sensor eliminators and there was a bit of a mix up with the shipping of the product. With that being said together we were able to figure it out! The whole time there was constant communication and the situation was rectified. There were very clear instructions included, we installed the sensors and they worked exactly as described. I highly recommend Magnum Tuning! Thanks!

0 of 1 people found this review helpful.

Was this review helpful?

YesNo

(5/5)

Ease of installation

Quality

Price to value ratio

Shipping & Wrapping

Customer & Tech Support

gas saver power booster work ride

Mated to my back muffler it's a gas saver power booster work ride and the big hit is it gets me notice ahead and keeps people out of my blind spots. Same as a (removed) if not better, my pal owns an exhaust shop, agrees the same, the only difference is it lasts not as long hence non-SS wormanship, 5 years minimum sounds good though. A bit heavier than other decats.

wow the sound is awesome.

used these on an older chevy that is a daily driver and wow the sound is awesome. I have (removed) catback system on my truck and couldn't justify it delivered more power without this decat pipe. For the price and the sound you can't go wrong with this pipe, the overall quality is not that of the (removed) slip-on but works perfect and should last many years.

much smoother power delivery

after the stock cat was gutted i feel much smoother power delivery and engine responds heaps better, my criticism is about the instructions on the web site that were a way vague they caused me believe its pretty easy to fit this exhaust box to my stock system... it wasnt

1 of 11 people found this review helpful.

Was this review helpful?

YesNo

(5/5)

Ease of installation

Quality

Price to value ratio

Shipping & Wrapping

Customer & Tech Support

works and sounds great

I bought this decat for a friend since in his state this is not street legal. He have it installed by an exhaust fitter in an hour and I was told, it works and sounds great. He was so delighted, he persisted to post a review for this product. It's good value for money, probably the least priced in non-offbranded quality category.

works absolutely as it is suppose to

same as a (removed) decat pipe if not better, my friend owns a car shop, agrees the same, only difference is its durability is expectedly not as long, they say 5 years minimum is good though, technical support works absolutely as it is suppose to

sound nice and deep

Great muffler! Installed decat pipes without reading instructions. Perfect fit. I purchased them to replace my stock cat converters on my Escalade! Exhaust note is a lil louder than with cats but sound nice and deep! I would recommend to those who want to gut the restrictive catalytic converters but without that anoying ricey sound.

If you're chasing after for even more horsepower, replace the factory diffusion middle muffler with a high-flow absorption muffler. Performance absorption exhaust muffler is most commonly used by performance muffler manufacturers as it provides the least resistance to the exhaust gases that pass through while a diffusion muffler used by car manufacturers splits the flow of the exhaust gases up into a series of different paths using a series of plates & tubes called baffles. Wide open performance is the product of custom engineering these Magnum Middle Mufflers to deliver engine exhaust systems.

Mercedes 420SEC Cat Replacement

If your Car-Truck-SUV seems sluggish off the line, it is non economic or if you are sick and tired of getting stomped always, try adding a Mercedes Gas Accelerator Muffler /replaces the stock catalytic converter/ today. Install our 420SEC 4.2L Decat without high leveled skill within a reasonable time. DIY installation is easy to understand. As a manufacturer, we exactly know how to guide Customers shopping for Decat Pipes. Backed by our 17-year experience in manufacturing we run 7-day Technical Support. Easy to Follow instructions comes with your package. It is hard to believe, but true, there is a simple addition you are able to make to that sleek 420SEC 4.2L yours to increase driving power painlessly on your specific Mercedes. This original Magnum Decat is simple to install and as the best Decat Pipe on the market, it can improve HP / low end torque as well enhance acceleration. To modify exhaust flow via the Car-Truck-SUV exhaust system reflects to the latest technology among engine tuning solutions. Your 420SEC 4.2L Decat Pipe will be entirely compatible with the stock exhaust system, that was originally equipped by Mercedes. Thanh emailed us the following evaluation, Hi Magnum, got my package in perfect condition, have Decat fitted by a trusted technician. I am fully satisfied, yeah! Once again, thank you guys for everything. Jake, you are the BEST!